The invention discloses a basin-type insulator density uniformity testing method which comprises the following steps: (1) a basin-type insulator to be detected is placed on a rotating platform, the industrial ray chromatography detection technology is adopted, and rays transilluminate the basin-type insulator in a manner perpendicular to the axial line of the basin-type insulator to obtain a basin-type insulator circular-ring shaped chromatography image; (2) the circular-ring shaped chromatography image is divided into sectors with the same angle according to the common circle center, and each sector is divided into fan-shaped net regions in the radial direction of the common circle center at equal intervals to obtain the average gray-value of the whole circular-ring shaped chromatography image and gray difference percentage between the gray value of each fan-shaped net region and the average value; (3) the points with the maximum density, the points with the minimum density, and the regions with the maximum density changing rate are worked out. Through the adoption of the method, the density uniformity of the basin-type insulator can be accurately and effectively evaluated, the overall evaluation is realized, the detection speed is high, and the safe operation level of the power grid is improved.